Counter target spell. At the beginning of your next upkeep, pay . If you don't, you lose the game.
Those who expect betrayal at every turn are seldom disappointed.
Official Rulings for Pact of Negation
6/7/2013 : Although originally printed with a characteristic-defining ability that defined its color, this card now has a color indicator. This color indicator can't be affected by text-changing effects (such as the one created by Crystal Spray), although color-changing effects can still overwrite it.
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